ScriptReference/Animations.TransformStreamHandle

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ScriptReference/Animations.TransformStreamHandle

https://docs.unity3d.com/ScriptReference/Animations.TransformStreamHandle.html

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Comment by @HilariousCow:

Difference between TransformStreamHandle and TransformSceneHandle is really important (and the similar names can trip you up!)
Stream Handles are values which are adjusted inside the playable graph/animation job. But only inside. If you try to change the outside, all that happens is, they'll override their positions based on any animations that animate their properties. If they are not animated by anything, they will use the "default" values for their orientation... i.e. localPosition = Vector3.zero, localRotation = Quaternion.identity.
If you need some bone or target you need to manipulate and have the graph use it, use a Scene Handle, not Stream Handle. Also bear in mind that you cannot write to this inside the job.
So:
SceneHandles = Job Inputs (kinda like the parameters for your job)
StreamHandles = Job Outputs (which start out animated/at default values, but you can manipulate them in the stream)